Sharks have a laterally compressed eye with a large and spherical lense. Its eyes are particularly sensitive to movement in dim light. Sharks may have some colour vision since they have cone cells in their eyes. At the back of the eyes there is a reflecting layer of cells, called the tapetum lucidum, which reflects the light back again to help it see more effectively.A sharks pupil can dilate and contract and in clear water the shark can see up to 15 m.
Sharks and batiods have taste buds in their mouths but these have not been studied extensively. It may help in the final acceptance or rejection of the prey items.
The shark have paired external nostrils which leads to the olfactory organs. They have an acute sense of smell and can detect some chemicals in such dilutions as one part in a billion and up to 100 m away.
E. Ampullae of Lorenzini:
The ampullae of Lorenzini forms a complex and extensive sensory network around the sharks head. External pores cover the surface of the sharks head and each leads to an jelly filled canal connected to a membranous sac called an ampulla. These sacs have sensory cells which detects weak electrical fields over short ranges. They are only effective within a few centimetres, as they sense bioelectrical fields in the final stage of prey capture. The ampullae may also detect temperature, salinity, mechanical stimuli and magnetic fields.